Its 0-10" W

BOARD ECONOMIZER RRS BASIC S1-031-03645-000

Is the Weil McLain 383-500-205 switch compatible with Ultra Series 2 boilers

operating with direct acting logic at 15 psig and reverse acting logic at 20 psig

Resideo HE100A1000 Humidifier 320074-702 Its 0-10" WThe Resideo HE100A1000 is a whole house bypass humidifier engineered for precision moisture control in residential applications up to 2,000 square feet. As the direct replacement for the Honeywell 500 series, this unit integrates seamlessly into existing ductwork with a familiar footprint, significantly reducing retrofit labor. The TrueEase bypass humidifier employs an efficient flow through design, delivering a 12 gallons per day capacity (46 liters)